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- https://www2.scopus.com/home.uri/ Scopus
- benthamscience.com / Bentham Science Publishers
- ebsco.com›products/research…ebsco…dissertations/ EBSCO (DISSERTSATIONS
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- socionet.ru/ SOSIONET
- elibrary.ru/ İMF-elibrary
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- doabooks.org/ Directory of Open Acess journals (DOAJ)
- oapen.org/Open Access Publishing in European networks (OAPEN)
- ocw.mit.edu/MIT OpenCourseWare
- open.umn.edu›opentextbooks/ Open Textbook Library
- https://opensource.com/education/Open Course Library
- khanacademy.org/ Khan Academy
- oercommons.org /OER Commons
- en.wikipedia.org›2/Wikipedia
- Wikimedia Commons
- https://www.elibrary.imf.org/
- https://www.cabi.org/cabebooks/ebook/
- https://www.proquest.com
- https://link.springer.com
- https://www.mhebooklibrary.com
- https://www.taylorfrancis.com/
- https://www.bartleby.com
- https://www.bookyards.com
- http://www.freetechbooks.com/
- https://libguides.nus.edu.sg
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